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data_dictionary: exercise.sas7bdat
description: |
This dataset is used in a tutorial about interactions. A description from the original source: The dataset consists of data describing the amount of weight loss achieved by 900 participants in a year-long study of 3 different exercise programs, a jogging program, a swimming program, and a reading program which serves as a control activity. Researchers were interested in how the weekly number of hours subjects chose to exercise predicted weight loss.
loss:
label: Average weekly weight loss
note: negative scores denote weight gain
scale: real
unit: unknown, presumably pounds
hours:
label: weekly average amount of exercise
unit: hours
effort:
label: weekly effort scores
note: self report
scale: non-negative integer
range: 0 through 50
direction: 50 denoting maximum physical effort
prog:
label: exercise program
note: reading is a control
values:
Jogging: 1
Swimming: 2
Reading: 3
female:
scale: binary categorical
values:
male: 0
female: 1
satisfied:
label: satisfied with weight lost
scale: binary categorical
values:
Dissatisfied: 0
Satisfied: 1
10.005 + 2.291*2 = 14.58710.005 + 0.707*20 = 24.14510.005 + 2.291*2 + 0.707*20 + 0.393*2*20 = 44.447Descriptive Abstract: Sample of 654 youths, aged 3 to 19, in the area of East Boston during middle to late 1970’s. Interest concerns the relationship between smoking and FEV. Since the study is necessarily observational, statistical adjustment via regression models clarifies the relationship.